JP3302028B2 - Signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal generator, and more particularly, to a signal generator capable of selectively generating a plurality of different signals.

[0002]

2. Description of the Related Art Conventionally, a digital signal is obtained by using a code plate provided with a gray code pattern portion and reading the gray code pattern portion with a reading member such as a brush. There have been proposed various devices configured to obtain position information and the like of an object.

FIG. 5 is a schematic explanatory view of a conventional code plate having a gray code pattern portion composed of a plurality of patterns and a signal generator using brushes.

In FIG. 5, 1 is a code plate, P0, P
1 and PC are patterns for generating each bit signal, and these constitute a gray code pattern portion. The reading of the gray code pattern portion is performed by brush 2
Is brought into contact with the gray code pattern portion, and
And the bit signal is obtained.

[0005] In the above configuration, the switching point of the reading of the gray code pattern portion is at each position of B, C, and D, and the whole can be divided into four sections I to IV for determination.

The bit signal obtained is connected to the connection terminal 1a.
Is transmitted to another printed wiring board (not shown) through
The data is input to arithmetic processing means such as a microcomputer and used for various controls.

[0007]

However, in the above-mentioned conventional example, there is only one switching point for reading (hereinafter, referred to as a division position). For example, the focal length, subject distance, etc. in an interchangeable lens of a single-lens reflex camera. When a signal generator as in the above-mentioned conventional example is used for detecting the signal, there are the following problems.

First, usually, the division position necessary for detecting the focal length, subject distance, and the like in the interchangeable lens of a single-lens reflex camera differs from model to model. For this reason, it is difficult to use a common code plate, and a code plate having a gray code pattern portion different for each model has been created. However, creating a different code plate for each model has a great disadvantage in terms of cost, and this tendency is particularly remarkable in a model of small lot production.

Second, on the premise that the code plate is shared, a method of increasing the number of bits and making the division finer is also conceivable. However, an input pin of a microcomputer for inputting a signal from a signal generator and performing arithmetic processing is provided. Must be provided more than necessary, and the arithmetic processing capacity must be increased more than necessary, which leads to an increase in the size of the microcomputer, and also has great disadvantages in terms of cost and space.

[0010] The present invention is to solve the above problems. That is, an object of the present invention is to provide a signal generation device that can be shared among a plurality of models without increasing the number of bits more than necessary.

[0011]

According to a first aspect of the present invention, there is provided a signal generating apparatus for generating a signal by using a bit pattern of a part of a plurality of tracks. , And only one of the tracks is used to generate a signal for a corresponding bit. In the case of having a brush provided with a contact piece that comes into contact with the track, the number of the re-contact pieces is made smaller than the number of the plurality of tracks, and the contact piece is formed only in a part of the tracks. (See FIGS. 2 and 3), the number of tracks and the number of contact pieces are set to be the same, and the contact pieces are brought into contact with each of the plurality of tracks. Only some of the contact pieces may be connected to the output transmission member (see FIG. 4). Further, when a brush having a contact piece that contacts a track is provided, the number of the plurality of tracks and the number of the contact pieces are made equal, and the contact piece is brought into contact with each of the plurality of tracks related to the same bit, and the Out of a plurality of tracks for the corresponding bit, only one track for generating a signal for the corresponding bit may be connected to the output terminal (see FIG. 1). In the signal generating device according to the second aspect of the present invention, a contact piece is brought into contact with each of a plurality of tracks separated from each other, and a signal is generated using a bit pattern of a part of the plurality of tracks. (See FIG. 1). Further, in the signal generating device according to the third aspect of the present invention, the contact piece is brought into contact with a part of the plurality of tracks connected to each other to generate a signal using the bit pattern of the part of the tracks. (See FIGS. 2 and 3). Further, in the signal generating device according to the fourth aspect of the present invention, a contact piece is brought into contact with each of a plurality of tracks connected to each other, and a signal is generated using a bit pattern of a part of the plurality of tracks. (See FIG. 4). In the fifth invention of the present application,
In a signal generator for generating a signal using a gray code pattern, a signal having a plurality of types of patterns with respect to the same bit is used, and a signal relating to a corresponding bit is generated using only one of the plurality of types of patterns. I have to. When a brush having a plurality of contact pieces that come into contact with the gray code pattern is provided, the contact pieces may be brought into contact with only some of the bit patterns (see FIGS. 2 and 3). The contact pieces may be brought into contact with all the bit patterns, and only some of the contact pieces may be connected to the output transmission member (see FIG. 4). Further, when a brush having a plurality of contact pieces that come into contact with the gray code pattern is provided, the contact piece is brought into contact with each of a plurality of types of patterns related to the same bit, and the corresponding one of the plurality of types of the patterns is contacted. Only one pattern for generating a signal related to a bit may be connected to the output terminal (see FIG. 1).

[0012]

According to the present invention, at least one of a plurality of patterns constituting a signal generating pattern can be selectively read, so that a signal for a plurality of models can be obtained without increasing the number of bits more than necessary. A common generator can be used.

[0013]

FIG. 1 shows a first embodiment of the present invention.

In FIG. 1, reference numeral 3 denotes a code plate, on which a plurality of patterns P0, P0 ', P1, and PC for forming a gray code pattern are provided.

Here, the pattern P0 and the pattern P0 'are patterns of the same bits forming the Gray code pattern.

A connection terminal 3a is connected to another printed wiring board for outputting a bit signal. Reference numerals 3b and 3c denote lands for pattern shorts.
Alternatively, it is possible to select which bit signal of the pattern P0 or the pattern P0 ′ is to be output from the connection terminal portion 3a by short-circuiting one of 3c by means such as soldering.

Further, reference numeral 4 denotes a brush, and patterns P0, P
On each pattern of 0 ', P1 and PC, the slider is slid in the range from the position A to the position E, whereby a bit signal can be obtained. For example, land 3 for pattern short
When b is shorted, the patterns P0, P1, PC
Is obtained, and the division position is B,
When the lands 3c for pattern short are shorted to the positions C and D, division positions B ', C and D' by the patterns P0 ', P1 and PC are obtained.

As described above, in this embodiment, a plurality of kinds of patterns of the same bit constituting the gray code pattern are provided, and one of the patterns is selected to be connected to the output pattern. By doing so, it is possible to output a plurality of different signals.

FIG. 2 shows a second embodiment of the present invention.

In FIG. 2, 5 is a code plate, 6 is a brush, and the code plate 5 is provided with patterns P0, P0 ', P1, and PC for forming a gray code pattern connected to each other. I have. However, the pattern P0
And the pattern P0 'are the same bit patterns.

On the other hand, the brush 6 has contact pieces 6a, 6b, 6
c are held in contact with the patterns P0, P1 and PC in a state of being electrically insulated from each other, and can output a bit signal.

In the configuration shown in FIG. 2, when the brush 6 moves in the range between the position A and the position E, the dividing positions B and
The bit signal is switched between C and D. When attaching the code plate 5 and the brush 6, the contact pieces 6a, 6b, 6c of the brush 6
However, by attaching the brush 6 and the code plate 5 in a state where the relative positions thereof are shifted (state of reference numeral 6 ') so as to be in contact with the patterns P0', P1 and PC, respectively, the dividing positions are set to B ', C and D' Can be changed.

FIG. 3 shows a third embodiment of the present invention, which is an example in which the above-described second embodiment is developed to output three types of division positions.

In FIG. 3, reference numeral 7 denotes a code plate and 8 denotes a brush. The code plate 7 has patterns P0, P0 ', P1, P1', PC for forming a gray code pattern.
Are connected to each other. Here, the patterns P0 and P0 'and the patterns P1 and P1' are patterns of the same order bit.

On the other hand, the brush 8 has contact pieces 8a, 8b, 8
c are held in contact with the patterns P0, P1 and PC in a state of being electrically insulated from each other, and can output a bit signal.

In the configuration shown in FIG. 3, when the brush 8 moves in the range from the position A to the position E, the dividing positions B,
The bit signal is switched between C and D. When attaching the code plate 7 and the brush 8, the contact pieces 8a, 8b, 8c of the brush 8 are attached.
Are in contact with the patterns P0, P1 'and PC (state 8') or the patterns P0 ', P1 and P
By mounting in a state of contacting with C (state of 8 ″), the dividing position can be changed to B, C ′, D or B ′, C, D ′.
Can be changed to

As described above, the above-described second and third embodiments are configured so that the pattern of a plurality of equivalent bits can be selected by changing the relative positions of the code plate and the brush. ing.

FIG. 4 shows a fourth embodiment of the present invention.

In FIG. 4, 9 is a code plate, 10 is a brush, and the code plate 9 has patterns P0, P0 ', P1, P1', P for forming a gray code pattern.
C are provided connected to each other. here,
The patterns P0 and P0 'and the patterns P1 and P1' are patterns of the same bits.

On the other hand, the brush 10 has contact pieces 10a, 10a.
b, 10c, 10d, and 10e are electrically insulated from each other, and the patterns P0, P0 ', P1, P
1 ', held in contact with the PC.

Reference numeral 11 denotes a printed wiring board for transmitting the output of a bit signal.
b, 10c, respectively, and can transmit the bit signal output by these contact pieces.

In the configuration shown in FIG. 4, when the brush 10 moves within the range from the position A to the position E, the bit signals are switched at the division positions B, C and D. Further, the connection position of the printed wiring board 11 is changed so that the contact pieces 10b, 10c, 10
By setting the state of transmitting the output of d (state of reference numeral 11 ') or the state of transmitting the output of the contact pieces 10a, 10b, and 10e (state of reference numeral 11 "), the dividing position is changed to B,
It can be changed to C ', D or B', C, D '.

As described above, in the fourth embodiment, it is possible to output a plurality of different signals by configuring so that the connection position of the printed wiring board for transmitting the output can be selected.

In the above-described embodiment, a two-bit signal generator capable of generating two or three types of signals has been described. However, the present invention is not limited to these. It is also possible to combine the techniques in the embodiments.

[0035]

As described above, according to the present invention,
In a signal generating means having a signal generating pattern and a signal reading member for reading the signal generating pattern, at least one of a plurality of patterns constituting the signal generating pattern is configured to be selectively readable. So it can generate several different signals,
The signal generators can be shared among a plurality of models without increasing the number of bits more than necessary, which is advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a third embodiment of the present invention.

FIG. 4 is a plan view showing a fourth embodiment of the present invention.

FIG. 5 is a plan view showing an example of a conventional technique.

[Explanation of symbols]

 Reference numeral 3: code plate 3a: connection terminal portion 3b, 3c: land for pattern short P0, P0 ', P1, PC ... pattern A, B, B', C, D, D ', E ... position

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01D 5/00-5/62 G01B ⁷ /00-7/34 G01P 1/00-3/80 G02B 7/08

Claims (19)

(57) [Claims] A bit of a part of a plurality of tracks is recorded.
Signal generator that generates signals using
Has multiple tracks for bits of the same
Using only one of the multiple tracks
A signal generator for generating a signal for a corresponding bit . 2. The method according to claim 1 , wherein each of a plurality of bits includes
Multiple tracks for each bit, multiple for each bit
Using only one of the tracks
Generating a signal relating to a bit
Item 2. The signal generator according to Item 1 . 3. The same peer bit for only one bit.
A plurality of tracks related to the
Bit using only one track of the track
2. A signal according to claim 1, wherein
A signal generator as described . 4. Bed provided with a contact piece in contact with the track
4. The method according to claim 1, wherein the brush has a brush.
A signal generator according to any one of the above . 5. The method according to claim 5, wherein :
A small number of the contact pieces are part of the plurality of tracks;
5. The apparatus according to claim 4, wherein only the first track is contacted.
The signal generator according to claim 1 . 6. The number of the plurality of tracks and the number of the contact pieces are the same, the contact piece is in contact with each of the plurality of tracks, and one of the plurality of contact pieces is provided. 5. The signal generator according to claim 4 , wherein only the contact piece of the portion is connected to the output transmission member. 7. The output transmission member is a printed wiring board.
7. The signal generator according to claim 6, wherein: 8. Bed provided with a contact piece in contact with the track
A number of the plurality of tracks and the number of the contact pieces,
Are the same, and a plurality of
The contact piece is in contact with each of the
The corresponding bit of the plurality of tracks for the bit
Only one track that produces a signal about the output
2. The signal according to claim 1, wherein the signal is connected to a terminal.
Signal generator . 9. The peer-only video for one bit only.
A plurality of tracks related to the
Generate a signal for the corresponding bit of the
Make sure that only one track is connected to the output
The signal generator according to claim 8, wherein 10. A plurality of tracks separated from each other.
A contact piece is brought into contact with each of the plurality of tracks.
Signal using the bit pattern of the track
Signal generator . 11. A plurality of tracks connected to each other.
The contact piece is brought into contact with some of the tracks in the
Signal generation using the bit pattern of the
Raw equipment . 12. A plurality of tracks connected to each other.
A contact piece is brought into contact with each of the plurality of tracks.
Signal using the bit pattern of the track
Signal generator . 13. A signal is generated using a Gray code pattern.
In the signal generator to generate,
Having a plurality of types of patterns, and among the plurality of types of patterns,
Use only one to generate a signal for the corresponding bit.
A signal generator characterized in that the signal is generated . 14. The method according to claim 14 , wherein each of a plurality of bits is
It has multiple types of patterns for bits of the same
Use only one of multiple types of patterns for each
Generating a signal about the bit to be changed
A signal generator according to claim 13 . 15. Touching the gray code pattern
A contractor having a brush with a plurality of contact pieces.
15. The signal generator according to claim 13 or 14 . 16. The contact piece has only a part of the bit pattern.
16. The signal according to claim 15, wherein
Signal generator . 17. The signal generator according to claim 15, wherein the contact pieces are in contact with all the bit patterns, and only some of the contact pieces are connected to the output transmission member. 18. The power transmission member is a printed wiring board.
18. The signal generating device according to claim 17, wherein
Place . 19. Touching the gray code pattern
It has a brush with a plurality of contact pieces.
The contact piece contacts each of a plurality of types of related patterns.
The corresponding bit of the plurality of patterns.
Only one pattern that produces a signal about the
The terminal according to claim 13, wherein the terminal is connected to the terminal.
Signal generator .